Fizeau Interferometers

AccuFiz UV, Visible, and NIR Fizeau Interferometers

AccuFiz Fizeau interferometers offer an unmatched combination of performance, quality and value in optical metrology. They produce accurate, repeatable interferometric measurements of surface shape, radius of curvature and transmitted wavefront quality, through using a laser light source which reflects off a reference surface and a test surface to create an interference pattern of the two light beams. In a Fizeau interferometer, the laser beam's light waves function as the measuring stick used to plot surface variations. Interferometric measurements are extremely sensitive and precise in plotting surface shape changes, and modern metrology techniques are able to plot pixel to pixel height differences at levels that are a tiny fraction of the wavelength.

AccuFiz Fizeau laser interferometers fit well in confined lab spaces. No more back-breaking dead lifts! The compact, lightweight design is extremely rigid for high stability in any orientation or environment.

Full range and fully developed accessories selection

Order these Fizeau interferometers in wavelengths from 355 nm through 1.064 µm. The standard product has apertures from 33 mm to 800 mm, and configures both horizontally and vertically with mounting. 4D's mature line of product offerings and accessories provide the right options for a wide range of applications and budgets.

High resolution camera option

The optional 6 megapixel, high resolution camera captures the highest slopes of any commercial interferometer. With high slope range capability, you can have optical metrology of aspheres, freeform optics and highly aberrated elements.

Isolate plane-parallel surfaces

One common shortcoming of the long-coherence laser in Fizeaus is the inability to measure plane parallel surfaces. The Surface Isolation Source (SIS) option adds the ability to measure plane-parallel optics without coatings or back-surface treatments. It eliminates unwanted second-surface reflections. Quantify shape, optical thickness, transmitted wavefront error, and homogeneity on optics as thin as 300 µm.

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Four inch and six inch apertures are our most common customer selections. In production environments or the lab, AccuFiz Fizeau interferometers provide industry-leading repeatability.

Rigid for best results, anywhere

Maximum stability is essential for optical metrology, and these interferometers will operate successfully in any orientation or environment. The AccuFiz Fizeau's compact, lightweight design is extremely rigid.

Accurate lateral resolution

No more recalibrating lateral dimensions when you zoom. Only AccuFiz includes Smart Zoom™ to ensure accurate lateral resolution over the entire 1X–10X zoom range.

Plane-parallel optics are transparent components with parallel faces, or systems with two or more parallel surfaces. Measuring plane-parallel optics with a laser interferometer can be challenging, as the parallel surfaces can all contribute unintended interference, making measurement extremely difficult or impossible.

Problem solved

Getting good measurements with plane-parallel test pieces becomes easy and quick with our optional Surface Isolation Source. Order SIS with your AccuFiz Fizeau Interferometer if you need this unusual capability.

High performance aperture converters and mounts let you leverage the performance of a standard AccuFiz to measure optics up to 800mm in diameter. Kinematic mounting allows quick removal of the AccuFiz for stand-alone operation. Better yet, you can return it to the aperture converter with no need for re-alignment. 4D Fizeau Interferometer aperture converters embody numerous conveniences and technological improvements to form a superior beam-expander system, easy and convenient, without a loss in performance.

Short Coherence Laser Interferometers

FizCam dynamic short coherence laser interferometers are designed for challenging measurements such as remote cavities, simultaneous measurement of multiple glass surfaces. They also perform measurements in environmental testing chambers and provide an analysis of moving parts. With acquisition time under 1 millisecond and a completely on-axis design, FizCam systems provide extremely accurate measurement in a lab or in noisy environments, such as production floors and cleanrooms.

Fizeau Mounts and Optics

4D optical mounts and other accessories provide the flexibility and reliable, worry-free operation you need to complete your optical setup. Whether you require a highly repeatable test rig for production measurement or a complex setup for a unique measurement, 4D mounts and accessories will help you maximize measurement accuracy and minimize alignment and setup time.

In addition to optical mounts and accessories, we offer a range of options for radius of curvature measurements from slides to automated systems.